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Home Forums Conferences 2010 Breakout Discussion – Texas Tuesday Discussion Groups

This topic contains 0 replies, has 1 voice, and was last updated by  4 drums coker 9 years, 9 months ago.

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  • #2670

    4 drums coker
    Participant

    Safety

    Hot Drums
    1) Remote Drilling
    Sound monitoring top and bottom
    Cameras
    Remote digital control from a Control Room
    Sensor to determine slack cable
    2) Remote Unheading
    Minimize risk of boil-over
    Drain drum before opening top head
    Open top head before opening bottom head
    3) Interlock System
    Have a total interlocking system of MOV valves with both top and bottom heads.

    Operations

    • Banana effect
    • Liquid in bypass line
    • Switch midpoint how long
    • On-line spalling medium temperature
    • Quench steam rates
    • Foaming
      Blowdown
      Early drum
    • Sludge injection
    • Double quench
    • Auto-shift cutting tool
    • Remote cutting/unheading
    • Automation
      Getting humans off the structure
      Increased level of process control sophistication
    • More training

    Maintenance / Reliability

    • Drill Stems Operation Cutting Tools
    • Bending Stem
      Maint issues: Leakage/Break

    • Monitoring: Drill Positioner
      Procedures
      Case Study discussed that show reduction in maint costs
  • Water Filtration/Quality
  • Problem: Large fines causing maint issues in bits and pumps
    Increase filtration
    Increase frequency of cleaning holding tanks
  • Bulging/Cracking/Deformation (leaning)
  • Assessing
    Laserscan Where and Is it Growing
  • Thermal Gradient: Health Monitor System to measure process to minimize damage during operation
  • Leaning
    Side inlet causing preference to oneside of drum
  • Process

    • Control the heater outlet to get a drum inlet temperature of about 900F.
      Lower temperatures cause sandy coke, which leads to hot spots and blowouts
    • Some locations ramp their heater outlet for the last 4 hours to help reduce the potential for hot spots ramp 7 deg F at the end of the fill
    • Need to monitor the drum OVHD temperature before the quench to help prevent sandy coke.
    • Raising heater outlet temperature helps the coke morphology reduces sandy coke (hot spots)
    • There can be crude type mismatches that can cause sandy or dusty coke. May need to limit the crude differences to coke avoid problems with hot spots

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